<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <button id="connect">连接</button>
  <button id="send" disabled="true">发送数据</button> <br>
  从服务器接收的数据如下:<br>
  <span id="content"></span>
  <script>
    var connect = document.querySelector('#connect') 
    var send = document.querySelector('#send') 
    var content = document.querySelector('#content')
    var ws = null
    connect.onclick = function() {
      ws = new WebSocket('ws://localhost:9998')
      ws.onopen = () => {
        console.log('连接服务器成功');
        send.disabled = false
      }
      ws.onmessage = msg => {
        console.log('从服务器收到了数据');
        content.innerHTML = msg.data
      }
      ws.onclose = e => {
        console.log('服务器关闭了连接');
        send.disabled = true
      }
      send.onclick = function () {
        ws.send(JSON.stringify({
          action: 'themeChange',
          socketType: 'themeChange',
          chartName: '',
          value: 'chalk'
        }))
      }
    }
  </script>
</body>

</html>